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By Tim Thwaites in Adelaide PERPLEXED by the sparsity of plant life immediately surrounding the Great Barrier Reef, two Queensland biologists may have stumbled on a clutch of new, natural weedkillers that appear to be harmless to people, animals and crop plants. Jim Burnell, a molecular biologist from James Cook University, was out scuba-diving on the reef, which runs along the coast of Queensland, when it struck him that the coral was extremely bare in places. “Everything on the reef was thriving except for free-growing seabed plants,